1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 *
4 * Copyright (C) International Business Machines Corp., 2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * Common Internet FileSystem (CIFS) client
8 *
9 * Operations related to support for exporting files via NFSD
10 *
11 */
12
13 /*
14 * See Documentation/filesystems/nfs/exporting.rst
15 * and examples in fs/exportfs
16 *
17 * Since cifs is a network file system, an "fsid" must be included for
18 * any nfs exports file entries which refer to cifs paths. In addition
19 * the cifs mount must be mounted with the "serverino" option (ie use stable
20 * server inode numbers instead of locally generated temporary ones).
21 * Although cifs inodes do not use generation numbers (have generation number
22 * of zero) - the inode number alone should be good enough for simple cases
23 * in which users want to export cifs shares with NFS. The decode and encode
24 * could be improved by using a new routine which expects 64 bit inode numbers
25 * instead of the default 32 bit routines in fs/exportfs
26 *
27 */
28
29 #include <linux/fs.h>
30 #include <linux/exportfs.h>
31 #include "cifsglob.h"
32 #include "cifs_debug.h"
33 #include "cifsfs.h"
34
35 #ifdef CONFIG_CIFS_NFSD_EXPORT
36 static struct dentry *cifs_get_parent(struct dentry *dentry)
37 {
38 /* BB need to add code here eventually to enable export via NFSD */
39 cifs_dbg(FYI, "get parent for %p\n", dentry);
40 return ERR_PTR(-EACCES);
41 }
42
43 const struct export_operations cifs_export_ops = {
44 .encode_fh = generic_encode_ino32_fh,
45 .get_parent = cifs_get_parent,
46 /*
47 * Following export operations are mandatory for NFS export support:
48 * .fh_to_dentry =
49 */
50 };
51
52 #endif /* CONFIG_CIFS_NFSD_EXPORT */
53
54
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